Lawyers in Turpan, an oasis city southeast of the regional capital, Urumqi, have to sign a pledge denouncing extremism and participation in "illegal religious activities", the Xinjiang judicial affairs department website said on Tuesday.

"Lawyers must commit to guaranteeing that family members and relatives do not wear burqas, veils or participate in illegal religious activities, and that young men do not grow long beards," the statement said.

While many Uighur women dress in much the same casual fashions as other women in China, others have begun to wear full veils, something more common in Pakistan or Afghanistan than traditionally in Xinjiang.

As an "important force" for protecting social stability, lawyers must take a leading role in combating extremism, the statement said, adding that 57 lawyers and six law students had signed the pledge so far.

The demand comes after a car ploughed through bystanders on the edge of Tiananmen Square in Beijing and burst into flames in late October, killing the three people in the car and two bystanders. China called it a "terrorist attack" carried out by Islamist militants from Xinjiang.

More than 40 people were hurt, and the police have detained five people in connection with the attack.

But Uighur exiles, rights groups and some experts have cast doubt on the official accounts.

The main Uighur exile group, the World Uyghur Congress, said it feared those who did not sign the pledge risked losing their licence to practice law or would face investigation.

"China's judicial reform forces Uighur lawyers into a choice: safeguard the sanctity of their duty as lawyers and lose their personal freedoms, or violate their professional ethics and support China's suppression of the Uighur people," the group's spokesman, Dilxat Raxit, said in an emailed statement. (Reporting by Michael Martina; Editing by Nick Macfie)

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